It will come through people revolution all these corrupt politicians will be thrown out and this corrupt democratic system will end Interest based economy will be slowly finished leadership will be chosen with a different process than this corrupt system of elections all the laws will be made purely based on Quran and Sunnah their will be no political parties in Islam because it creates divide among Muslims
And the basis of doing exactly this in the Quran and Sunnah is? Can you quote me a prominent religious scholar - not a medical doctor or professor who has suddenly starting found "religion" that calls for overthrowing the current regime to establish an "Islamic society"
Infact, I can guarantee you that in the 1400 year history you will be hardpressed to find any Islamic scholar of repute. Infact, they actively opposed such type of "revolutions" while at the same time advocating non-violent public protests.
The only exception is the famous scholar Ibn Tamiyah who did give an ruling about fighting against the Mongol regime that had invaded and devastated Muslim lands all the way till present day Iraq and Syria. The Mongols had just converted to Islam after the devastation and despite that Ibn Tamiyah argued that it was valid to fight against them.
I won't go into the details of his fatwa but suffice to say that just last year, prominent scholars from around the world including India, KSA, Turkey Iran all gathered in Mardin, the same place where he gave the fatwa and recast the fatwa in today's light. The main idea being that the medieval concept of dar-ul harb and darul Islam no longer applies in countries were freedom of religion is allowed. These countries are now darul aman or darul ahd.
Here are a list of the speakers
Speakers | Mardin Conference
The new Mardin declaration is here
http://www.mardin-fatwa.com/attach/Mardin_Declaration_English.pdf
In short, other than Ibn Tamiyah, there is no important Islamic scholar who has justified or supported such "revolutions" to overthrow established political orders or a concept of theocracy where the clerics are the head of state.
Infact, this concept of revolution is more akin to other vanguard movements particularly from the Marixist-Leninist thought where the proletariat would join hands towards a revolution, smash the political order and establish a utopia where the proletariat would live in equality under a single party state. And the similar concept is with other fringe political religious nationalist movements as well.
Hence this "concept" is of a recent origin popular in a section of a younger frustrated generation who think that a easy quick fix "Revolution" will solve all their problems.
You already have two examples, Iran and Afghanistan where this has happened, and within Pakistan and Bangladesh at the lack of support to political Islamic parties. In fact, without the support of the military establishment, Islamic political parties would probably never have been in the ruling dispensation. This is not because people don't revere Islam as a faith. Polls show consistently that more than 90% of people in Bangladesh and Pakistan consider religion as very important to their personal lives. But they know that religion in politics where parties and people use it as a political tool is not just deviant and useless but also counter productive and regressive.
